অ্যাকুয়াসল AE211 – টোটাল হার্ডনেস টেস্ট কিট (২৫০ টেস্ট)

🔹 For Low Range (2 – 40 ppm)

1. Take 25 ml of the water sample in the test jar.
2. Add one spoon of TH 1S and mix well until dissolved.
3. Add 10–12 drops of TH 2 and mix properly.
4. If the solution turns blue, it indicates no hardness. If it turns red, hardness is present.
5. Add TH 3 dropwise, counting each drop while mixing, until the color changes from red to blue.
6. If the color does not change after 20 drops, hardness is above 40 ppm.

Calculation:
Hardness (ppm as CaCO₃) = 2 × number of drops of TH 3

🔹 For High Range (25 – 500 ppm)

1. Take 10 ml of the water sample in the test jar.
2. Add one spoon of TH 1S and mix well.
3. Add 10–12 drops of TH 2 and mix.
4. Add TH 5 dropwise, counting drops while mixing, until the color changes from red to blue.

Calculation:
Hardness (ppm as CaCO₃) = 25 × number of drops of TH 5

⚠️ Important Tips

• Always count drops carefully for accurate results
• Rinse the test jar before and after use
• Keep reagents tightly closed after use
• Avoid exposure to heat and sunlight